Results:

Firefox 13.0.1

Pseudos apply to <object>, <hr>, <input type="image"> (!)

From the HTML5 list, the <embed> is to only one who pseudos apply to.

Chrome 19.0.1084.56

Whilst pseudos apply to most input elements, it's curios that on elements like <input type="submit">, <input type="reset"> and <input type="button"> pseudo-elements do not apply. <textarea>, <object> and <hr> also support pseudos applied.

Pseudo-elements apply here to all new HTML5 form inputs.

Safari 5.1.7

Safari, who is running on WebKit (same as Chrome) behave quite different though. From the HTML4 list, the <object>, <hr>, <input type="checkbox">, <input type="radio"> and <input type="file"> do support pseudos applied.

Comparing to Chrome, from the HTML5 list, elements like <audio>, <video> and <keygen> are the only one who support pseudos. Now, that's a quite big difference comparing to Chrome!